Turn on the first for one min and then turn it off. 1 S# i) D! a. p- o- C& dTurn on the 2nd for five min and then turn it off.$ p% d$ M7 e/ v+ ?
Turn on the 3rd and leave it on. q. F3 T! o" {) x0 s
And then go upstairs right away. 2 v0 a x- h! }3 P; N) h 4 k$ j4 m( t/ b* a8 o# {4 ^1 wFind the answer by using your fingers and eyes& c7 a2 C4 F5 X8 D- z
这只是一个智力问题,不象是电工问题。
原帖由 老警察 于 2009-1-16 07:12 发表 5 J' A7 U: Z8 G) t# w. ~Turn on the first for one min and then turn it off. $ Y: O9 q$ b; F" \% ^Turn on the 2nd for five min and then turn it off. ; R( e2 I# |. Z% j oTurn on the 3rd and leave it on. ( j3 Y" {/ F& X. l1 r$ d; tAnd then go upstairs right away.& T8 t! j, V$ m9 B4 o9 G1 @- ^
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Find the answer by using ...